Here's a collection of vero (stripboard) and tagboard guitar and bass effect layouts that we have put together covering many classic and popular effects in growing numbers. Many of these have been posted on freestompboxes.org, so check that site out for great discussions on building your own effect pedals. Enjoy the builds and please also visit us on Facebook and Twitter

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Wednesday, 27 August 2014

CBS Arbiter Doubler

Thanks to Pawel for his schematic posted on FSB. I can't find much info on this one or clips, but it is very close to being a Foxx Tone Machine so that should give you a good idea what to expect.

Pawel traced two units with the second being slightly different, using BC109 transistors, the 100K Q3 base resistor is 150K, the 5n cap is 3n3, and all pots are 100K log, so build whichever one takes your fancy, or socket the positions to try both.

Wow! Thanks for this one, I just wish the dude in the demo would have used the neck pickup with the tone rolled down for some of the demo LOLI like the fuzz tones of this pedal and the upper octave is there for sure... very nice!

Verified!just build it and it worked perfectly from the first moment! ok...the first attempt was with no transistors...it happens to everyone!anyway. it's working great, all pots have a good use range.i didn't use a stomp for the octave switch. i've used a toggle one.. i don't have any bc549 and i have only 3 bc109. so i've put the bc550 's , witch work really good with this.thanks markyou are the man!

In case anyone cares, I have an original Doubler circuit board that I built a new enclosure for.The transistors used are BC173, which are pretty hard to find, but it is a high gain, low noise Silicon NPN transistor. So the BC549 should be a great replacement, unless you care to spend $5 for each transistor.My original Doubler has all A50K pots in it, even the Sustain pot, and the 5n cap should be a 3n3 cap.If I get a chance, I will try to trace it.

Are 10uf coupling caps after sustain and filter pots (lugs 2) necessary if there are the same caps just before these pots? What's the purpose to put these twice? Does DC "get back" into the circuit from a ground through pots by any chance? Also, isn't a 10uf value a bit overestimated? I've seen Wolfshirt used 1uf for coupling caps for this circuit and it seems enough I think.

The Marshall 3005 Lead 12 was a mini-stack with a 12 watt solid state head made in England between 1988 and 1991. People claim it's a gr...

Note

Not all these layouts are verified and some are put together from unverified schematics. So if you have good luck, or bad luck for that matter, then please let me know by dropping a comment in the topic. Thanks.

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